Ways driving in traffic differ from walking on a crowded sidewalk

Question 1: In a survey cited in the journal New Scientist (Byrne, 2000), one-sixth of drivers who described themselves as generally being mild-mannered in temperament admitted to often feeling angry when behind the wheel of their vehicles.
In what ways does driving in traffic differ from walking on a crowded sidewalk? What social-psychological factors might account for automobiles provoking negative emotions?

Question 2: What biblical principle(s) apply in the above scenario?